Legend drug prescriptions expire after how long from the date written?

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The main idea is how long a prescription for a legend (prescription-only) drug stays valid after the date written. In most places, such a prescription is valid for one year from the date written. That means the pharmacy can dispense or renew refills up to one year after that date, provided the prescription allows refills. After one year, a new prescription from the prescriber is needed to continue therapy. This rule helps ensure ongoing medical review and safety. Note that different rules can apply for controlled substances, but for legend drugs the typical window is one year.